PEBBLE BEACH – Dudley Hart faced his greatest fears last summer when doctors found a softball-sized lump on his wife’s lung, which kept him off tour the last half of the season to care for his triplets while she recovered.

All things considered, staring down Vijay Singh in the final round at Pebble Beach no longer seems as intimidating.

Hart, who hasn’t been in serious contention in nearly four years, finally got the best of Spyglass Hill on Saturday with a bogey-free round of 4-under 68 for a share of the lead with Singh at the AT&T Pebble Beach National Pro-Am.

Singh made an eagle on the par-5 12th at Spyglass on his way to a 67 to join Hart at 9-under 207, the highest score to lead after 54 holes at Pebble Beach since 1990.

They were two shots ahead of PGA Tour rookie Dustin Johnson and Michael Allen.

Defending champion Phil Mickelson lost all hope of being the first repeat winner at Pebble since Mark O’Meara in 1989-90 when he took an 11 on the par-5 14th and went from trying to stay in contention to missing the cut. He finished with a 78.

Hart atop the leaderboard is surprising for a couple of reasons.

He has not had at least a share of the lead since the 1996 Canadian Open, which he went on to win for the first of his two victories. And he is still trying to get back into a rhythm of tour life after a summer of uncertainty involving wife Suzanne, who had two-thirds of her right lung removed but is getting back to normal.

“It opens your eyes to what’s truly important sometimes,” Hart said. “I think we all take for granted what we have, whatever we’re doing, and take our health for granted. It definitely scared me. I kept looking at those kids and I can’t imagine … God forbid, when they get that tumor out, it comes back bad and they don’t have their mom around. That fortunately wasn’t the issue.

“You have a lot of positive and negative thoughts, but the negative ones really scare you.”

It’s been all good at Pebble, from his share of the lead to weather that makes the Monterey Peninsula feel like paradise.

Hart traditionally struggles with Spyglass, and he had his moments. He made good escapes from the bunker on No. 9 and 16 to save par, made birdies on the short par 3s, and finished with two birdies that put him atop the leaderboard.

Johnson, who made it through all three stages of Q-school last year, shot a 68 at Pebble Beach that included a wedge he holed out from 85 yards for eagle on No.13.

Singh brought some star power to a leaderboard that had been littered with Nationwide Tour graduates for most of the week, and he might have had the lead outright except for missing birdie putts of 4 feet and 7 feet on the final two holes.